Isaac newton rogers



Pate nted Fab; 7, I899.

I No. s|9,227.

N, ROGERS. SAFETY BRAKE FUR ELEVATOR EARS.

(Application died Sept. 27, 1897.) (Ila Model.) 2 Sheets-Shoat I.

WI TNESS as cu. FHOYO-LITND WASHANGTON. u. c,

No. 6l9,227.' Patented Feb. 7, I899.

I. N. ROGERS. SAFETY BRAKE FOB ELEVATOR CARS. No Model.) (Application med sept- 27, g x S) '2 Sheats-$haat 2.

r I I UNITED STATES PATENT OFFICE.

ISAAC NEIVTON ROGERS, OF NEWV YORK, N. Y.

SAFETY-BRAKE FOR ELEVATOR-CARS.

SPECIFICATION forming part of Letters Patent N0. 619,227, dated February 7, 1899.

Application filed september 27, 1897. Serial No. 653,132. (No model.)

To all whom it may concern.-

Be it known that I, ISAAC NEWTON ROGERS, a citizen of the United States, and a resident of New York city, county of New York, and State of New York, haveinvented certain new and useful Improvements in Safety-Brakes for Elevator-Oars, of which the following is a specification, reference being had to the accompanying drawings, forminga part thereof, in which similar letters and figures of reference indicate corresponding parts.

This invention relates to improvements in safety-brakes for elevator-cars; and the object thereof is to providea mechanism of this character adapted to automatically and positively stop an elevator-car in the event of breaking of the suspending-rope or when the car is descending beyond its normal speed.

The device further comprises means for readily releasing the brake mechanism after the car has been stopped, whereby the same can be readily moved in the event of its being located between stations.

The invention will be hereinafter fully described, and specifically set forth in the annexed claims.

Referring to the drawings, Figure l is a vertical sectional elevation illustrating an elevator shaft and car having an improved mechanism attached thereto. Fig. 2 is an inverted plan view, on an enlarged scale, of a portion of the bottom of a car. Fig. 3 is a detail sectional elevation taken on the line :0 cc of Fig. 2, and Fig. 4 is a sectional plan view taken on the line '3 y of Fig. 3.

In the practice of this invention a beam or plank A is secured centrally across the bottom of the elevator-car. Extended vertically through this said beam and into the floor l of the car (see Fig. 3) is a shaft or spindle B. To the lower end of this said shaft is secured a lever O, and immediately above the said lever is also secured a cam D, (see Fig. 2,) comprising two oppositely-located eccentrically-extended segmental projections d. The cam D is supplied with segmental slots cl, which engage the bolts cl secured within the beam A, whereby the cam and its connected shaft are retained in position.

A gear-wheel E is located upon the shaft B above the cam l) (see Fig. 2) and is cast integral with the cam or otherwise securely fastened thereto. T This said gear-wheel meshes with the pinion F,which is an integral part of a spindle G, (see Fig. 3,) the said spindle having a square head g formed thereon, with a socket g therein adapted to engage a rod H, which has a lever or wheel h secured to the upper end thereof, whereby the pinion F may be gradually turned in a backward direction to swing the cam D for the purpose of lowering the elevator-car to the next floor or to another floor, where it may be stopped by turnin g the wheel or lever h in a forward direction.

The ratchet-wheel I (see Fig. 3) is secured to the operating-rod H, and this said ratchetwheel engages a pawl J for the purpose of look ing the mechanism in any desired position. (See Fig. 4.)

In practice the rod H,with its ratchet-wheel is removed and placed in some convenient locality in the car while the elevator is being operated or used. The pawl J is also removed and placed out of the way, (in the car,) and in order to secure the said pawl in its proper position it is pivoted to plate j, which has pins j extended downwardly therefrom for engagement with recesses j in the elevator-floor 1. (See Figs. 3 and 4.)

Engaging the periphery of the cam D (see Fig. 2) are two oppositely-located bolts K, and they are maintained in normal contact with the said cam by means of springs 70, located between the hangers L, the inner ends of the said springs being secured to the bolts, so that the inner ends of the bolts are always pressed against the outer edge of the cam. These said bolts are provided at their outer ends with V-shaped projections or Wedges K, which engage and operate the dogs M when a sufficiently-increased motion of the descending car causes the governor to act and to detain the rope O, which is attached to the end of the lever C, thereby revolving said cam until its increased diameter has driven the wedges K to part the rear ends of the dogs M until the fall of the car is stopped. These dogs are pivotally connected with the plank A (see Fig. 2) within the boxes N by means of spindles m. The other ends of the dogs M have shoes m, (see Fig. 2,) which are pivotally connected thereto and bear loosely against the ICO one end to the free end of the lever C (see' Figs. 1 and 2,) and thence carried laterally over a pulley 4, thence upwardly over the governor-pulley 5, thence downwardly to a weighted pulley 6, and thence to the roof of the car, where it is secured. Secured to the shaft 7, which carries the governor-pulley 5, is a beveled gear-wheel 8, which meshes with" a pinion 9, secured to a horizontal shaft 10. This said shaft carries the governor 11, comprising semi-elliptical spring-arms 12 and weights 13. The outer ends of the arms 12 are secured to a fixed collar 14 and the inner ends to a sliding collar 15. Upon the sliding collar 15 is an annular flange or projection 16, adapted to engage in a swinging latch 17. This said latch has a lug 18 extended therei from which engages a fixed projection 19, the lower end of the latch being connected to a i weighted lever 20, which is pivoted to a box .21, theinner end thereof being connected to be arranged to produce the trip in ways that may be varied ad infinitum to suit the pleasure of the designer. I

In theoperation and use of the device when the car is moving at a normalspeed the rotary motion of the governor-pulley 5 will be given a comparatively low rate of speed; but

in case of accident or breakage of the suspending-rope 2 the rapid revolution of said governor-pulley 5 will by centrifugal force cause the weighted lever 20 to fall, and thus to bind the rope 0 between the surfaces of 21 and 22, whereby the weight of the car will operate the lever C, rotate cam D, and force the bolts K outwardly, whereby their projected wedge-shaped heads will force the dogs M apart and press the shoes m tightly against the said uprights 3 and securely lock the carriage in position. When it is'desired to again use the car, it is simply necessary to rotate the cam in a backward direction by means of the operating-rod H.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An improved safety-brake for elevators, comprising two oppositely-located bolts as de scribed, dogs engaging said bolts and carry- 7 ing the shoes for engagement with uprights of the elevator-shaft, and a double eccentric cam for throwing the said bolts in opposite directions, thereby operating the dogs, means for retaining the said bolts against the eccentric surfaces of the cam, and means compris- -.ing a governor and rope attachment for automatically operating said'cam, substantially as shown and described.

2. An improved safety-brake for elevators, comprising two oppositely-located cam-actuated bolts, having wedge-shaped outer ends, and dogs engaging said wedge-shaped ends, said dogs having shoes on their outer ends for engagement with uprights of the elevatorshafts, and a double eccentric cam for forcing said bolts outwardly, and means for retaining said bolts against the surfaces of the cam, comprising a spring, and a lever engaging the said cam, a governor, and connections between said governor and lever, for automatically operating the cam, substantially as shown and described.

3. An improved safety-brake for elevators, comprising two oppositely-located bolts, as described, dogs engaging said bolts and carrying the shoes for engagement with uprights of elevator-shaft, and a double eccentric cam for throwing the said bolts in opposite directions for purpose set forth, means for operating the cam within the car, comprising the gear-wheel E, attached to the cam, the pinion meshing into said gear-wheel secured on a vertical shaft with suitable head, and passing a corrugated shoe 22, and the governor may.

nearly through elevator-floor, and means for operating said pinion and its shaft consisting of the detachable rod H with wheel and provided with a ratchet-wheel secured thereon and a pawl acting upon said ratchet-wheel pivoted as shown, and all arranged substantially as and for the purpose set forth.

4. An improved safety-brake for elevators, comprising two oppositely-located bolts as described, dogs engaging said bolts and carrying the shoes for engagement with uprights of elevator-shaf t, and a double eccentric cam for throwing the said bolts in opposite directions for purpose set forth, and springs for retaining bolts against said cam, means for operating the said cam within the car for purpose set forth, comprising the gear-wheel E cast integral with the cam, the pinion meshing into said gear-wheel secured on a vertical shaft with a suitable head and passing nearly through elevator-floor, and means for operating said pinion and its shaft consisting of the detachable rod with wheel and provided with a ratchet-wheel secured thereon and a pawl acting upon said ratchet-wheel pivoted as shown, and all arranged substantially as and for the purposeset forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 22d day of September, 1897.

ISAAC NEWTON ROGERS.

VVitnessesi O. SEDGWIoK, B. MoCoMB. 

